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Volvo 940, B230FK -1995 rough idle...

 
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Knut Solem

External


Since: Dec 18, 2005
Posts: 4



(Msg. 1) Posted: Sat Apr 28, 2007 10:03 am
Post subject: Volvo 940, B230FK -1995 rough idle...
Archived from groups: alt>autos>volvo (more info?)

Normally, I think I can fix almost everything on a car, but this one... Ok ,
please read and be surprised (ehrm... ok, I know...)...

I've tried everything...
Ignition:
Spark plugs - new
Cables - new
Distributor cap - new
Distributor parts, all new..

Fuel:
Injectors cleaned
Wireing checked...
Fuel pump, ok
Fuel press., ok
Lambda, ok

Air:
New filter
Hoses, ok
AMM, ok
Intercooler, ok
Turbo, ok

Else:
Normal temp.
Oil consumption, ok - close to nothing.
No bad noises...
Enough power while coasting and accelleration...
Fuel consumption, ok (according to user manual)

Once in a while the engine seems to stall, but catches up and runs ok
again...
No system in the "caughs". Very random.
Warm engine and idle at factory settings.
It's like a human flu... random caughs...
A very mild smell of burned oil... Strange...
Example: Red light at a crossing, and stopping, engine at idle, rough idle
and a mild smell of burned oil...

Help!...
Anyone...

--
Regards
Knut Solem

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TKM

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Since: Oct 03, 2006
Posts: 13



(Msg. 2) Posted: Sat Apr 28, 2007 6:32 pm
Post subject: Re: Volvo 940, B230FK -1995 rough idle... [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

"Knut Solem" wrote in message

> Normally, I think I can fix almost everything on a car, but this one... Ok
> , please read and be surprised (ehrm... ok, I know...)...
>
> I've tried everything...
> Ignition:
> Spark plugs - new
> Cables - new
> Distributor cap - new
> Distributor parts, all new..
>
> Fuel:
> Injectors cleaned
> Wireing checked...
> Fuel pump, ok
> Fuel press., ok
> Lambda, ok
>
> Air:
> New filter
> Hoses, ok
> AMM, ok
> Intercooler, ok
> Turbo, ok
>
> Else:
> Normal temp.
> Oil consumption, ok - close to nothing.
> No bad noises...
> Enough power while coasting and accelleration...
> Fuel consumption, ok (according to user manual)
>
> Once in a while the engine seems to stall, but catches up and runs ok
> again...
> No system in the "caughs". Very random.
> Warm engine and idle at factory settings.
> It's like a human flu... random caughs...
> A very mild smell of burned oil... Strange...
> Example: Red light at a crossing, and stopping, engine at idle, rough idle
> and a mild smell of burned oil...
>
> Help!...
> Anyone...
>
> --
> Regards
> Knut Solem
>
Hmmm. I have the same problem. Here's another vote to find the solution.

Once before though it was faulty plug cables... but you say you've replaced
those.

TKM

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pathayes81946

External


Since: Jan 21, 2007
Posts: 2



(Msg. 3) Posted: Sun Apr 29, 2007 1:56 am
Post subject: Re: Volvo 940, B230FK -1995 rough idle... [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

With the limited information you have provided I'd suggest that your
symptoms are consistent with a lean stumble. Over a period of time
intake valves will develop carbon deposits on the surface constantly
exposed to incoming fuel. At some point the deposits become heavy
enough to absorb fuel as it is injected leading to a shortage of fuel
in the cylinder. This is especially true at closed loop/hot idle and
is much less obvious under throttle.

We use a Snap-On/Motorvac fuel system cleaner to address this
condition. Your mechanic can provide more information.

Regards
 >> Stay informed about: Volvo 940, B230FK -1995 rough idle... 
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Knut Solem

External


Since: Dec 18, 2005
Posts: 4



(Msg. 4) Posted: Mon Apr 30, 2007 11:56 pm
Post subject: Re: Volvo 940, B230FK -1995 rough idle... [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

skrev i melding

> With the limited information you have provided I'd suggest that your
> symptoms are consistent with a lean stumble. Over a period of time
> intake valves will develop carbon deposits on the surface constantly
> exposed to incoming fuel. At some point the deposits become heavy
> enough to absorb fuel as it is injected leading to a shortage of fuel
> in the cylinder. This is especially true at closed loop/hot idle and
> is much less obvious under throttle.
>
Thanks for trying to help.
I'm sure someone in this community knows the problem and the solution.

Well known problem the carbon deposits.
But a few weeks ago I had to mount a new cylinder head gasket because of a
crack in the gasket causing a coolant leak.
An inspection of the cylinder head revealed nothing strange.
No deposits on the valves or in the combustion chamber.
Cylinder no 4 had traces of oil on the pistion top. Not much, but using a
paper towel I got small traces of oil. The other cylinders was all fine.
The oil consumption is normal. Close to nothing.

The car runs well, and has enough power.
The problem started more than a year ago, so I'm starting getting a bit
xxxxx (fill in with suitable word...) now.

Ask the Volvo shop... no chance... They won't answer unless they get paid
for it...
Once I tried, but the answer was: spark plugs, cables, water in the fuel,
and so on...
Nothing revolusionary new...

--
-Knut
 >> Stay informed about: Volvo 940, B230FK -1995 rough idle... 
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Steve L

External


Since: May 01, 2007
Posts: 2



(Msg. 5) Posted: Tue May 01, 2007 11:36 pm
Post subject: Re: Volvo 940, B230FK -1995 rough idle... [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

I had this exact problem and now is cured. There seems to be an issue with
the engine management system. Here in the UK, an item on the BBC consumer
advice program called "Watchdog" revealed that quite a few Volvo owners were
having problems like this. Volvo agreed to modify the EMU free of charge to
owners of certain types of Volvo. Mine was one of these so I had it done
and now it's great. No idle problems. Here is the TV program website link
http://www.bbc.co.uk/consumer/tv_and_radio/watchdog/reports/transport/...nsport_
hope this helps.
Steve

"Knut Solem" wrote in message

> Normally, I think I can fix almost everything on a car, but this one... Ok
> , please read and be surprised (ehrm... ok, I know...)...
>
> I've tried everything...
> Ignition:
> Spark plugs - new
> Cables - new
> Distributor cap - new
> Distributor parts, all new..
>
> Fuel:
> Injectors cleaned
> Wireing checked...
> Fuel pump, ok
> Fuel press., ok
> Lambda, ok
>
> Air:
> New filter
> Hoses, ok
> AMM, ok
> Intercooler, ok
> Turbo, ok
>
> Else:
> Normal temp.
> Oil consumption, ok - close to nothing.
> No bad noises...
> Enough power while coasting and accelleration...
> Fuel consumption, ok (according to user manual)
>
> Once in a while the engine seems to stall, but catches up and runs ok
> again...
> No system in the "caughs". Very random.
> Warm engine and idle at factory settings.
> It's like a human flu... random caughs...
> A very mild smell of burned oil... Strange...
> Example: Red light at a crossing, and stopping, engine at idle, rough idle
> and a mild smell of burned oil...
>
> Help!...
> Anyone...
>
> --
> Regards
> Knut Solem
>
>
 >> Stay informed about: Volvo 940, B230FK -1995 rough idle... 
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